Keep track of network error in ProxyRetryInfo.

components/data_reduction_proxy/browser/data_reduction_proxy_usage_stats.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_usage_stats.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/metrics/histogram.h"
@@ skipping 205 matching lines @@
   if (data_reduction_proxy_params_->
           AreDataReductionProxiesBypassed(request, NULL)) {
       RecordBypassedBytes(last_bypass_type_,
                           DataReductionProxyUsageStats::NETWORK_ERROR,
                           content_length);
   }
 }
 
 void DataReductionProxyUsageStats::RecordBypassEventHistograms(
     const net::ProxyServer& bypassed_proxy,
-    int net_error,
-    bool did_fallback) const {
+    int net_error) const {
   DataReductionProxyTypeInfo data_reduction_proxy_info;
   if (data_reduction_proxy_params_->IsDataReductionProxy(
       bypassed_proxy.host_port_pair(), &data_reduction_proxy_info)) {
     if (data_reduction_proxy_info.is_ssl)
       return;
     if (!data_reduction_proxy_info.is_fallback) {
       RecordDataReductionProxyBypassInfo(
           true, false, bypassed_proxy, BYPASS_EVENT_TYPE_NETWORK_ERROR);
       RecordDataReductionProxyBypassOnNetworkError(
           true, bypassed_proxy, net_error);
@@ skipping 112 matching lines @@
         default:
           break;
       }
       break;
   }
 }
 
 }  // namespace data_reduction_proxy